06-流媒体-YUV数据在SDL控件显示

整体方案：
采集端：摄像头采集（YUV）->编码（YUV转H264）->写封装（Ｈ264转FLV）->RTMP推流
客户端：RTMP拉流->解封装（FLV转H264）->解码（H264转YUV）->YUV显示（SDL2）

YUV视频是通过SDL控件显示，首先要编译SDL库。
SDL2库源码：https://download.csdn.net/download/sishen4199/88547680

$ ./configure --prefix=/home/zg/zg_code/zg_test/video_ref/SDL/SDL2-2.28.5/build_lib
make
make install


#include <stdio.h>extern "C"
{
#include "SDL2/SDL.h"
};const int bpp=12;int screen_w=640,screen_h=360;
const int pixel_w=640,pixel_h=360;unsigned char buffer[pixel_w*pixel_h*bpp/8];//Refresh Event
#define REFRESH_EVENT  (SDL_USEREVENT + 1)#define BREAK_EVENT  (SDL_USEREVENT + 2)int thread_exit=0;int refresh_video(void *opaque){thread_exit=0;while (!thread_exit) {SDL_Event event;event.type = REFRESH_EVENT;SDL_PushEvent(&event);SDL_Delay(40);}thread_exit=0;//BreakSDL_Event event;event.type = BREAK_EVENT;SDL_PushEvent(&event);return 0;
}int main(int argc, char* argv[])
{if(SDL_Init(SDL_INIT_VIDEO)) {  printf( "Could not initialize SDL - %s\n", SDL_GetError()); return -1;} SDL_Window *screen; //SDL 2.0 Support for multiple windowsscreen = SDL_CreateWindow("Simplest Video Play SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,screen_w, screen_h,SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);if(!screen) {  printf("SDL: could not create window - exiting:%s\n",SDL_GetError());  return -1;}SDL_Renderer* sdlRenderer = SDL_CreateRenderer(screen, -1, 0);  Uint32 pixformat=0;//IYUV: Y + U + V  (3 planes)//YV12: Y + V + U  (3 planes)pixformat= SDL_PIXELFORMAT_IYUV;  SDL_Texture* sdlTexture = SDL_CreateTexture(sdlRenderer,pixformat, SDL_TEXTUREACCESS_STREAMING,pixel_w,pixel_h);FILE *fp=NULL;fp=fopen("sintel_640_360.yuv","rb+");if(fp==NULL){printf("cannot open this file\n");return -1;}SDL_Rect sdlRect;  SDL_Thread *refresh_thread = SDL_CreateThread(refresh_video,NULL,NULL);SDL_Event event;while(1){//WaitSDL_WaitEvent(&event);if(event.type==REFRESH_EVENT){if (fread(buffer, 1, pixel_w*pixel_h*bpp/8, fp) != pixel_w*pixel_h*bpp/8){// Loopfseek(fp, 0, SEEK_SET);fread(buffer, 1, pixel_w*pixel_h*bpp/8, fp);}SDL_UpdateTexture( sdlTexture, NULL, buffer, pixel_w);  //FIX: If window is resizesdlRect.x = 0;  sdlRect.y = 0;  sdlRect.w = screen_w;  sdlRect.h = screen_h;  SDL_RenderClear( sdlRenderer );   SDL_RenderCopy( sdlRenderer, sdlTexture, NULL, &sdlRect);  SDL_RenderPresent( sdlRenderer );  }else if(event.type==SDL_WINDOWEVENT){//If ResizeSDL_GetWindowSize(screen,&screen_w,&screen_h);}else if(event.type==SDL_QUIT){thread_exit=1;}else if(event.type==BREAK_EVENT){break;}}SDL_Quit();return 0;
}

PRJ_PATH	= .
TARGETS = video_prj
DIR_INC = ./inc
DIR_SRC = ./src
DIR_OBJ = ./obj
CXX = g++SRC := $(wildcard  ${DIR_SRC}/*.cpp)
OBJ := $(patsubst ${DIR_SRC}/%.cpp,$(DIR_OBJ)/%.o,$(SRC))FFMPEG_LIB_DIR	= $(PRJ_PATH)/third_lib/ffmpeg/lib
FFMPEG_INC_DIR	= $(PRJ_PATH)/third_lib/ffmpeg/includeSDL_LIB_DIR	= $(PRJ_PATH)/third_lib/SDL/lib
SDL_INC_DIR	= $(PRJ_PATH)/third_lib/SDL/includeINCLUDES	= -I$(DIR_INC)
INCLUDES	+= -I$(FFMPEG_INC_DIR)
INCLUDES	+= -I$(SDL_INC_DIR)LDFLAGS = -ldl -lpthread -lm 
LDFLAGS += -lX11 -lasound -lmp3lame -lz -lrt
LDFLAGS += -L$(FFMPEG_LIB_DIR) -lavformat -lavdevice  -lavcodec -lavutil  -lavfilter -lpostproc  -lswresample -lswscale
LDFLAGS += -L$(SDL_LIB_DIR) -lSDL2CXXFLAGS = -fpermissive
CXXFLAGS += -fPIC CFLAGS += $(INCLUDES)$(TARGETS):$(OBJ)$(CXX) $^ -o $@ $(LDFLAGS) $(CXXFLAGS)$(DIR_OBJ)/%.o:$(DIR_SRC)/%.cpp$(CXX) $(CFLAGS) -c $< -o $@ $(CXXFLAGS)
clean:rm -f $(TARGETS)rm -f $(DIR_OBJ)/*.o